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The phase constant $\phi$, also called phase shift or phase constant, measures where the oscillation started in the cycle. For the displayed wave equation, it is restricted to the interval $0 \leq \phi < 2\pi$ rad and must be expressed in radians.

Conditions: Applies to the phase constant $\phi$ in the traveling sinusoidal wave equation.; $\phi$ must be in radians for the equation.; The allowed range is $0 \leq \phi < 2\pi$ rad.

The phase constant $\phi$, also called phase shift or phase constant, measures where the oscillation started in the cycle. For the displayed wave equation, it is restricted to the interval $0 \leq \phi < 2\pi$ rad and must be expressed in radians.

Conditions: Applies to the phase constant $\phi$ in the traveling sinusoidal wave equation.; $\phi$ must be in radians for the equation.; The allowed range is $0 \leq \phi < 2\pi$ rad.